Process of making mantles for incandescent gas-lamps.



O. KAUFMAN. PROCESS OF MAKING MANTLES FOR INGANDBSGENT GAS LAMPS.

APPLICATION FILED 110v.10, 1909.

"$5,791 Patented Nov. 15, 1910.

1922 1 ,JQ/JQ 2,

Wvlimeooc o j UNITE STATES T ()FFIOE.

OTTO KAUFMAN, OE YOUNGSTOWN, OHIO, ASSIGNOR TO BLOCK LIGHT COMPANY, OF

YOUNGS'IO\VN, OHIO, A CORPORATION. OF NEW YORK- PROCESS OF MAKINGMANTLES FOB, INCANDESCENT GAS-LAMPS.

Wanna.

Specification of Letters Patent.

Patented Nov. 15, 1910.

Original application filed October 21, 1905, Serial N 0. 283,743.Divided and this application filed November 10, 1909. Serial No.527,152..

To all whom it may concern:

Be it known that I, Orro KAUFMAN, a citizen of the United States,residing at the city of Youngstown, county of Mahoning, State of Ohio,and whose post-otiice address is care of the Block Light Company, insaid city, have invented a certain new and useful Process of MakingMantles for Incandescent Gas-Lamps, of which the following is aspecification.

My invention relates to a process of making mantles for incandescentsfor lamps in which an illuminating gas or other illuminating fluids orliquids are employed for the purpose of incandescing a mantle.

The invention specifically relates to the manufacture of mantlesintended for use in inverted lamps or lamps of that class.

My invention has for its object to expedite and cheapen the manufactureof mantles, and it consists in the process hereinafter described andfurther pointed out in the claims,

The specific form of mantle embodying my invention, that is, one made bya specific embodiment of my invention, is shown in myapplication forimprovements in incandescent mantles, Serial Number 283,743, filedOctober 21., 1905, and of which this application is a division.

In the drawing illustrating my improved process, Figures 1 and 2 show anordinary mantle tube cut into proper lengths. Figs. 3, 4, and 5, show myimproved mantle in various stages of manufacture. Figs. 6 and- 7 arerespectively side and end elevations of the complete mantle with asupport attached.

Heretofore mantles for incandescent gas lamps, and especially those foruse in inverted lamps, have been made by gathering one end of the tubeof knitted material by the use of a string encircling one end of thetube or by passing the string through the loops of the knitting anddrawing the loops together. This is objectionable for the reason thatthese methods necessarily crease and fold the fabric and make it weakand dense atthe point where the stress is greatest when the mantle is inuse, so thatit soon breaks at the weakened point thereby rendering thelife of the mantle short and un certain, and by reason of therdensity ofthe mantle produced in the above ways, necessary increase in gaspressure is required to properly incandescence it, the result of whichis also to shorten the life of the mantle, to increase the expense ofits use, to complicate its use, and render it less citicient. By thepractice of my improved process, these folds and creases are abolished,and the mantle generally strengthened more particularly at the partfolded and creased as above described.

. In order to more thoroughly illustrate my improvement I shall describeone method of manufacturing mantles of this kind accord ing to a processpracticed prior to my invention.

Referring to Fig. 1, 1 designates a mantle tube cut 'to the properlength. This tube has generally been gathered by a string at its upperend and is folded and creased. When completed and ready for use, it willbe most easil broken at the creases, the place it shoul be strongestbecause here the mixed airand gas come mostforcibly in contact.

In practicing my invention a tube 4, Fig. 2 of suitable impregnatedwebbing, is cut transversely so as to have 4 curved tongues 5, eachidentical with the two shown in Fig. 4:. These tongues 5 are sewedtogether ring 8 secured by a tie-thread 9 as shown in Figs. 5 and 6, orit may be otherwise equivalently supported. The mantle is then burned,in other words, placed over a Bunsen burnerfaud subjected to its heat,and

-the pressure from the flow of the mixed air and gas emanating from saidburner, which strikes the interior of the mantle. .This shapesthemantle, forms a dome-shaped end (10) thereto,=and causes the reinforcingribs 6, to extend? transversely across the top of dome of thei mantle.interiorly, and in the specific form herein illustrated causing the fourreinforcing ribs to radiate from the center of the dome of the mantle,more particularly as shown in Fig. 7 of the drawing.

The. mantle is then stiffened by an application thereto of collodion orother suitable protecting covering, which may be readily burned away soas to leave the fragile skeleton of the mantle. It is then in the shape,as to the mantle, as indicated in Figs. 6 and 7; and it is ready to bepacked and shipped or used/in the customary manner.

In the foregoing has been described one embodiment of my invention, butmany others may be made, so I do not. regard it as limited to the exactprocesses discussed herein, said description being intended to be enoughto cover all structures that come within the scope of the annexedclaims.

Having thus described my invention what I claim is: 4

l. The process of manufacturing mantles, consisting in forming a-t-ubeof fabric, impregnating said fabric with an incandescing material,severing said fabric transversely of its length so as to form aplurality of cut and rounded edges, securing said edges together, andthen burning said mantle over a Bunsen burner to set the fabric in itsfinal shape.

'2. The process of manufacturing mantles, consisting in forming a tubeof fabric, impregnating said fabric with an incandescing material,severing said .fabric transversely of its length so as to form aplurality of cut and rounded edges, securing saidedges together,subjeeting'said mantle to the action of a. column of burning gas and airemanating from-a Bunsen tube to set the fabric in its final shape, andthen applying an gether to form seams, turning said mantle inside outand then burning said mantle over a Bunsen burner to set the fabric inits final shape, and stiffen the seams within the. mantle.

4. The process of manufacturing mantles cons1stmg in forming atube offabric, impregnating said fabric with an HICIIlldCSClHQ material,severing said fabric transversely of its length so as to form aplurality of cut and rounded edges, securing said edges to geth'er, thenturning the mantle inside out. then subjecting said mantle to the actionof a column of burning gas and air emanating from a Bunsen burner,forming internal stiffened seams, and then applying an adhesive andcombustible covering to the burned and set fal'iric. r

Signedat the city of Youngstown, State of Ohio. this 5th day ofNovember, 1909. OTTO KAUFMAN. Witnesses G. H. Bellman,

WM. I. GARVEY.

